Philosophy

In Marx' critique, ideology emerges from on a separation between knowledge and action. As soon as knowledge, or theory, is not returned to reality through action and in effect criticized by said action, it becomes a closed-system, an ideology, an *-ism. When the movement between knowledge and action is uninterrupted, when reality continuously criticizes knowledge, becomes the input of knowledge, which then returns to reality, a dialectic oscillation is created and there is no ideology.
As the entire system of human exploitation rests on separation, any ideology, regardless of its content, will serve the purpose of validating such separation and contributes to upholding the system.
Overall, there is no logical reason why one could not live outside ideology. There are however many circumstantial reasons why it is indeed very difficult as it goes against the way the world is currently organized and unified.